Android gravity sensing example

Many games in Android use gravity sensing technology,We have studied gravity sensing.

The source is at the bottom left of the screen, and the arrow points to a positive direction. From-10 to 10, the Unit is a floating point number. Consider the following:

 

When the mobile phone screen is placed horizontally up (Z axis to day), the values of (x, y, z) are (0, 0, 10 );

When the mobile phone screen is placed horizontally down (Z axis toward the ground), the values of (x, y, z) are (0, 0,-10 );

When the mobile phone screen is placed on the left (X axis to the day), the values of (x, y, z) are (10, 0, 0 );

The values of (x, y, z) are (0, 10, 0) when the mobile phone is vertical (Y axis to day );

The other analogy is that the day is a positive number, and the day is a negative number.

Using the three values of X, Y, and Z to calculate the trigonometric function, you can precisely detect the motion of the mobile phone.

CodeInstance:

Androidmanifest. xml

<Uses-Permission Android: Name = "android. Hardware. sensor. Accelerometer"/>

The code is very simple. Check the source code directly,Finally, source code download is provided.

Java code:

Package COM. learn. sunboy; </P> <p> Import android. app. activity; <br/> Import android. hardware. sensor; <br/> Import android. hardware. sensorevent; <br/> Import android. hardware. sensoreventlistener; <br/> Import android. hardware. sensormanager; <br/> Import android. OS. bundle; <br/> Import android. view. motionevent; <br/> Import android. widget. toast; </P> <p> public class testsensor extends activity {</P> <p> private sensormanager msensormanager = NULL; <br/> private sensor msensor = NULL; <br/> private float x, y, z; </P> <p> @ override <br/> protected void oncreate (bundle savedinstancestate) {<br/> super. oncreate (savedinstancestate); </P> <p> msensormanager = (sensormanager) This. getsystemservice (sensor_service); <br/> msensor = msensormanager. getdefasensensor (sensor. type_accelerometer); <br/>}</P> <p> sensoreventlistener lsn = new sensoreventlistener () {</P> <p> @ override <br/> Public void onsensorchanged (sensorevent event) {<br/> X = event. values [sensormanager. data_x]; <br/> Y = event. values [sensormanager. data_y]; <br/> Z = event. values [sensormanager. data_z]; <br/>}</P> <p> @ override <br/> Public void onaccuracychanged (sensor, int accuracy) {<br/> // todo auto-generated method stub </P> <p >}< br/> }; </P> <p> @ override <br/> Public Boolean ontouchevent (motionevent event) {</P> <p> If (event. getaction () = motionevent. action_down) {</P> <p> msensormanager. registerlistener (LSN, msensor, sensormanager. sensor_delay_game); </P> <p> string STR = "x =" + x + "; y =" + Y + "; Z =" + z; <br/> toast. maketext (getapplicationcontext (), STR, toast. length_long ). show (); <br/>}</P> <p> return Super. ontouchevent (event); <br/>}</P> <p> @ override <br/> Public void onresume () {<br/> msensormanager. registerlistener (LSN, msensor, sensormanager. sensor_delay_game); </P> <p> super. onresume (); <br/>}</P> <p> @ override <br/> Public void onpause () {<br/> msensormanager. unregisterlistener (LSN); </P> <p> super. onpause (); <br/>}</P> <p >}< br/>
Running effect:

Note: This is on the simulator (SDK v1.5). Since the simulator cannot sense gravity, please test it on the physical machine.

Source code download